Showing papers in "Solid State Ionics in 2005"

TL;DR: In this paper, materials formulated with respect to their mixed ionic/electronic conducting properties have been prepared and characterized using various techniques using various types of materials, including materials formulated Ln 2−−− x −− y y y Ca x NiO 4+− δ (with (i ) x ǫ = 0 for Lnǫ, La, Pr, Nd, (ii) x  = 0 when y Â= 0 or yǫ≠ 0 for ln  for lnn  or y

TL;DR: In this paper, the properties and applicability of iron and cobalt-containing perovskites were evaluated as cathodes for solid oxide fuel cells (SOFCs) in comparison to state-of-the-art manganite-based pervskites.

TL;DR: In this article, the Ni-YSZ anode supported direct-methane SOFCs on methane fuel was described and power densities as high as 0.52 W/cm2 at 700 °C and 1.27 W/ cm2 at 800 °C were observed.

TL;DR: In this article, the thermal expansion coefficient of yttria stabilized zirconia (YSZ) with the Y 2 O 3 content of 3, 6, 8 and 10 mol% were measured using a push-rod type dilatometer in the temperature range from 103 to 876 K.

TL;DR: In this article, an effective, dense and well adherent coating was produced on 430SS that has the result of significantly reducing the oxidation rate of this alloy at elevated temperatures, which is essentially a Mn-Co-O spinel, applied in powder form, and compacted to improve its green density.

TL;DR: The electrical conductivity of highly textured Yttria Stabilized Zirconia (YSZ) thin films deposited onto a MgO substrate can be enhanced significantly at thickness as mentioned in this paper.

TL;DR: In this article, the LSCF/CGO composite cathodes were investigated for SOFC application at intermediate temperature, i.e., 500-700 °C, on three types of tape-casted electrolyte substrates including CGO electrolyte, Yttrium-stabilized Zirconia (YSZ) electrolyte coated with a thin layer of CGO, and YSZ electrolyte.

TL;DR: In this article, the interfacial impedance of solid electrodes deviates from that of an ideal capacitor even in the complete absence of Faradaic reactions; the deviation is usually larger on rough electrodes than on smooth ones.

TL;DR: A series of radiation-grafted alkaline anion-exchange membranes (AAEMs) with degrees of grafting (by mass) in the range 20 − 26% were produced and characterised in this article.

TL;DR: In this paper, a nonaqueous hybrid supercapacitor using manganese oxide/MWNTs (M/M) composite and MWNTs as positive and negative electrodes, respectively, has been designed and investigated by constant current charge/discharge tests.

TL;DR: In this paper, the ageing effect of the electrical properties is interpreted by the presence of different defect associates present before annealing in all the doped zirconia specimens, or rather the transformation within these associates.

TL;DR: In this paper, a cross-linked polyvinyl alcohol (PVA)/poly(acrylic acid) (PAA)/silica hybrid membranes were evaluated for use as a proton exchange membrane for direct methanol fuel cell (DMFC).

TL;DR: In this paper, the reduction and oxidation kinetics of a Ni/YSZ cermet were studied at temperatures between 400 and 850 °C by thermogravimetric analysis (TGA).

TL;DR: In this paper, the effect of Al 2 O 3 nanoparticles on the electrochemical properties of polymer electrolyte has been investigated and it was shown that there is an interaction between the nanoparticles and C F bonds of polymer chain.

TL;DR: The carbonation and decarbonation behavior of BaCe0.9Y0.95 (BCY10) powder has been investigated as a function of gas composition and temperature by thermogravimetric analysis and X-ray powder diffraction as mentioned in this paper.

TL;DR: In this article, the electrical conductivity and phase stability of ZrO 2 co-doped with Sc 2 O 3 and CeO 2 were investigated in order to search for a better solid electrolyte material, which can be applicable for intermediate or low-temperature solid oxide fuel cells (SOFCs).

TL;DR: In this paper, a new computational approach for simulating impedance spectra of electrochemical systems from detailed models of elementary reactions and diffusion processes is presented, based on transient numerical simulations of the dynamics of the reaction-diffusion system when a periodic variation of overpotential is imposed.

TL;DR: In this paper, a solid oxide fuel cell (SOFC) membrane was developed in which zirconia-based electrolyte thin films were supported by a porous composite metal/ceramic current collector and were subjected to rapid thermal cycling between 475 and 1075 K (200 and 800 °C).

TL;DR: In this paper, a site deficiency was introduced intentionally into the mixed conducting perovskite ABO3-type oxide, La0.6Sr0.4Co0.2Fe0.8O3-δ (LSCF=6/4/2/8), in order to create additional oxygen vacancies.

TL;DR: In this paper, the influence of reduction and re-oxidation cycles on microstructure and residual stress of anode supported planar solid oxide fuel cells (SOFCs) has been studied.

TL;DR: In this paper, a dense YSZ-LSM composites were fabricated for application as an oxygen separation membrane, which achieved a density about 95% for a sintering temperature of 1350 °C; however, an insulating La 2 Zr 2 O 7 phase was formed during this high-temperature Sintering.

TL;DR: In this paper, the electrical properties of magnesium doped lanthanum silicates as an electrolyte for intermediate temperature solid oxide fuel cells (IT-SOFCs) have been investigated.

TL;DR: In this paper, the authors describe the application of Time-of-Flight Secondary Ion Mass Spectrometry (ToF-SIMS) to the determination, by depth profiling and imaging analysis, of 18 O tracer diffusion profiles in oxides.

TL;DR: In this article, several impedance spectroscopy models found useful for data fitting and interpretation of dielectric and conductive-system frequency data are briefly summarized and compared, and it is concluded, on the basis of both experimental and synthetic data fitting, that the corrected modulus formalism approach, with a temperature and ionic-concentration independent fractional exponent, β 1C ≤ 1/3, is the most appropriate model for representing the hopping response of homogeneous materials; an effective medium nearlyconstant-loss model describes such experimental loss data well; and the

TL;DR: In this paper, a novel structured mixed ionic and electronic conducting cathode was developed based on the (LaSr)MnO3 (LSM) electronic conducting structure impregnated with Gd-doped CeO2 (GDC) ionic conducting phase.

TL;DR: In this article, the effects of mixed conduction on the open-circuit voltage of intermediate-temperature solid oxide fuel cells (SOFCs) based on SDC20 were studied in the temperature range of 723-973 K.

TL;DR: LiNi 0.6 Co 0.2 O 2 was tested to be a promising cathode material for lithium ion batteries as discussed by the authors, which showed excellent cycling stability at RT when cycled in 2.8-4.3 V at 0.4 C rate.

TL;DR: In this article, focused ion beam/liftout (FIB/lift-out) techniques were used to prepare TEM specimens containing electrode/electrolyte interfaces in solid oxide fuel cells (SOFC).

TL;DR: In this paper, the surface exchange coefficient of polycrystalline La 2 Ni 1− x Co x O 4+ δ has been determined for the 30, 50, 80% and 100% Co doped materials and both the oxygen tracer diffusion coefficient, D *, and surface exchange coefficients, k, determined.

TL;DR: In this paper, a range of polyethylene-alt-tetrafluoroethylene (ETFE) membranes have been prepared by pre-irradiation grafting of styrene/divinylbenzene onto poly(methylene- alt -tetrabeltreeethylene) with graft level defined as mass of graft component added with respect to base film mass, spanning from 2.3% to 69%, and characterized ex situ for their fuel cell relevant properties.